Application Development Software

hi,guys

hurry issue....................hope get help.
I am using oracle weblogic 10gr3 portal.and we choiced java portlet.as of now,we got some question about custom Event.hope you can give some idea....

thank you so much.

question detail:

1.for java portlet ,how to define custom event.
2.how to trigger this event.
3 about the data,may be sometime need to transit Biz data.

auctully,I just want to implements between two portlets communicate.
for example:
existing portletA,portletB.

portletA is a list,like:
A AA <button>
after I click this buttom,then portletB will be effect,it means they are interact with each other.

does anybody hit this issue before,if you solved pls share me .

thank you for you help....